Apparatus for removing forms from concrete blocks



Aug. 30, 1949. 7 s 2,480,477

APPARATUS FOR REMOVING FORMS FROM CONCRETE BLOCKS Filed Aug. 13, 1946 IZ-rrzsf I Johzs Patented Aug. 30, 1949 UNITED STATES PATENT F FICE-APPARATUSjQREEMOVING- Foams FRQM I coNon 'rE BLGGKS ForrestH. Jones,Rockport, Wash. Application August 13, 1946;, seriai No. 690,113

My inventionrelatestoforms for producing concrete blocks or the like andmore particularly toapparatus tOTGli-ljOlftH tom-from the finishedblock.

The object of invention is to provide an apparatus to be pieced betweenthe'mold and the material tobe forriiedtlierein and adapted to be filledwith compressed air to lift andremove the formfrom the finished product.v 7

other objeets of the invention nray'appeari n thefolIowi-iigspecification describing my ir'n err-- tion with reference to theaccompanying drawing illustrating preferred {embodiment of my imfntifi.

It is, however, to be understood thatmy inven tior-i is not tobe limitedor restricted to the exact construction and combination of partsdescribed in the specification and shown in the drawing, but that suchchanges and'modifications can; be made which fall within the scope ofthe claims appended hereto.

In the drawing Figure 1 is a top View of an apparatus according temyinvention. 7 I I i Figure'2- is asectional view taken on line Z -2 inFigure 1 the apparatus beingshown in deflated position. 7 I H Figure 3'is a sectionalview similar to Figures, but showing the apparatus ininflated position and showing a connection between the apparatus and apipe line for compressed air, and

Figure 4 is an exploded sectional detail view of a fragment of the uppersection of the apparatus and the lower section thereof, showing acompressed air outlet in the upper section and a guide pin fitting insaid outlet and rigidly mounted on the lower section, the two sectionsbeing made from a center layer of textile and two layers of rubbercovering the center layer.

Referring now ,in detail to the drawing the apparatus according to myinvention has preferably a circular outline. In Figures 2 and 3 it isshown as being made from automobile body metal or the like. It has acircular upper section It], on which an upwardly extending hollow boss His either formed integrally or fastened rigidly, as by welding. The bossis located centrally of the circular section, A pipe I2 is located inand extends through the hollow boss II and through the top or uppersection l0. It is securely fastened in position by means of a washer l3,firmly attached to the underside of the upper section Ill, for instance,by welding. The upper end of the pipe I2 is provided with an outsidethread It adapted to be threadedly engaged by a coupling nut IS ons'oiaime (01. 25-120) .2 e 5 ahose f6 or the like connected with asource-of compressed air (not shown).

a plurality or holes :1 is provided in the upper section HF, and theseholes are arrangedat equal distances from the centrally located pipe 12and at equal angular distances from each other.

A lower section t8 has the same shape and size as the top section [0and-the two' sections are.

securely welded together at their circumference; so that the seam isair-' tigh-t.

' A plurality guide plugs l'9 are securely fas tenee'onto the upper"surface or the lower section it and are locatedthereon, so that theycome-- spend with the location of the holes 11 in the upper section to.Theplugs are finished to fit slidably said: holes. e

-, In: Figure 4;-

upper section is illustrated ccnisistirig of an inner layer 2t madefrom: teX tiIe' fabric and two outside layers 22' and 23 respec- 2i? tivefii 1132166 from rubber and covering the in tial layer; Thelbwersection 24 illustratedin Figure- 4 is also made or aninr ier textilelayer 25 and two outside rubber layers} 26 and 21 respectively coyeringthe inner textile layer 25.

embedded; This pipe corresponds to the pipe 2 in Figme sz'and 3 andadapted be engaged by acoupl-ing similar to the nut It A plurality ofholes 28, corresponding to the holes I! in Figure 3, is provided in theupper section 20 and the edges of these holes are protected againstdamage by thin steel washers 29 embedded in the textile layer 2| or bywales provided in said layer.

In the lower section 24 frustoconical countersunk washers 30 areprovided. Through each countersunk washer a countersunk screw 3| extendsupwardly, and a plug 32 is adapted to be engaged threadedly by andsecurely held on each screw. The screws are located so that the plugs 32fit slidably into the holes 28 in the upper section 20, when the twosections are connected with each other on their circumference to form anair-tight unit.

In use the above described apparatus is arranged on a form 33, in whicha concrete block. 34 or the like is to be formed, before the concrete ispoured. After the block 34 is finished and ready for removal, compressedair is permitted to flow into the apparatus, expanding it, as shown inFigure 3 and separating the form from the block easily and readily.

While my invention has been described in use 3 for removing cementblocks from the forms or vice versa, it is to be understood that it canalso be used for stripping forms from concrete walls and all other typesof concrete constructions.

Having described my invention I claim as new and desire to secure byLetters Patent:

1. An apparatus for stripping a form from a molded article by fluidpressure, comprising an expansible member adapted to be interposedbetween an inner surface of a form and the molding material containedtherein, said member comprising inner and outer coextensive sections ofimpervious sheet material disposed in superposed relation, said sectionsincluding marginal portions hermetically sealed together, means forintroducing fluid under pressure between said sections to expand saidmember, one of said sections being formed with at least one aperturetherethrough, a plug carried by the other section and extending throughsaid aperture, said plug being formed to have a close sliding flt insaid aperture, and said plug being adapted to be completely withdrawnfrom 'said aperture after predetermined expansion of said member,whereby to relieve fluid pressure therein.

An apparatus for stripping a form from a molded article by fluidpressure, comprising an expansible member adapted to be interposedbetween an inner surface of a form and the molding material containedtherein, said member comprising inner and outer coextensive sections ofimpervious sheet material disposed in superposed relation, said sectionsincluding marginal portions hermetically sealed together, means forintroducing fluid under pressure between said sections to expand saidmember, said outer section being formed with at least one aperturetherethrough, an inwardly directed plug carried by said inner sectionand extending through said aperture, said plug being formed to have aclose sliding fit in said aperture, and said plug being adapted to becompletely withdrawn from said aperture after predetermined expansion ofsaid member, whereby to relieve fluid pressure therein.

3. An apparatus for stripping a form from a molded article by fluidpressure, comprising an expansible member adapted to be interposedbetween an inner surface of a form and the molding material containedtherein, said member comprising inner and outer coextensive sections ofsheet metal disposed in superposed relation, said sections includingmarginal portions hermetically sealed together, and means forintroducing fluid under pressure between said sections to expand saidmember.

4. An apparatus for stripping a form from a molded article by fluidpressure, comprising an expansible member adapted to be interposedbetween an inner surface of a form and the molding material containedtherein, said member com prising inner and outer coextensive sections ofimpervious textile sheets disposed in superposed relation, said sectionsincluding marginal portions hermetically sealed together, and means forintroducing fluid under pressure between said sections to expand saidmember.

5. An apparatus for stripping a form from a molded article by fluidpressure, comprising an expansible member adapted to be interposedbetween an inner surface of a form and the molding material containedtherein, said member comprising inner and outer coextensive sections ofimpervious sheet material disposed. in superposed relation, saidsections including marginal.portions hermetically sealed together, meansfor introducing fluid under pressure between said sections to expandsaid member, one of said sections being formed with at least oneaperture therethrough, annular means reinforcing said aperture, a plugslidable in said aperture, means'detachably connecting said plug to theother section, and said plug being adapted to be completely withdrawnfrom said aperture after predetermined'expansion of said member, wherebyto relieve fluid pressure therein. r

FORREST H. JONES.

REFERENCES CITED The following references are of record in the

